Die-head.



N. P. PETERSEN.

DIE HEAD. APPLICATION FILED ocT.12. 191e,

41,249,81 9.. Patenmd 1160.111917.

j 2 SHEETS-SHEET l.

N. P. PETERSEN.

DIE HEAD.

- APPLICATION FILED oc. l2. wm.

'1,249,131 9. www@ n... 11,1917.

2 SHEETS-SHEET 2.

lll

'.tl'lElLS Il?. PETERSEN', OF LUS ANGELES, CALFRNIA.

JJIEwHEAID..

Application led etober 12, 1916.

To all u1/tom it may concern:

fle it known that l, Niets l). Fn'rniisnn, a citizen of the United States, residing at Los ,/ltngeles, in the county of Los Angeles and @tate of alifornia, have invented certain new and useful improvements in Die-Heads, of which the following is a specification.

This invention relates to a cutter head adapted to he used upon machine tools and particularly pertains to a combined cutter and die for use in the manufacture of bolts, screws and the like.

lt is an object of this invention to provide a cutter head which may be mounted to operate upon a lathe or screw machine and which will act in a semi-automatic manner to turn the body of the screw down to a given diameter and thereafter cut threads along this turned portion. p

Another object of this invention is to provide a thread cutter' or screw forming inachine having turning tools and threading tools in the same circumferential plane so that screw threads may be cut clear up to the shoulder formed by the turning tools.

Another object is to provide the turning tools and die bits within a single head so that `they may be compactly and rigidly secured and may be readily actuated to alternately move toward and away from the work.

Another object is to provide simple manually operated means for retractino" the turning` tools and advancing the die hit in relation to the work and to provide automatically operating means for restoringl the turning tools to their initial position and reti-acting the die bits. l i

Another object is to provide simple means for adjustably maintaining a given depth of cut upon the work and to positively insure that the turning tools and die bit will co-act in a manner to form a perfect 'thread .Another object is to provide tools and bits of special configuration 'so that they may be slidably mounted within the head without danger o f becomingwedged or disengaged from 'their seats.

lt is a further object to provide a cutter` head adapted to perform the above functions and which is comparatively simple in Specification of Letters Patent.

Patented Dee. 11, 1917.

serial no. leases.

its construction and may he readily and positively ope ated.

Other objects will appear hereinafter.

The invention is illustrated, by way of example, in the accompanying drawings in which: p

Figure l is a view in plan andelevation illustrating the cutter head as mounted within the tail stock of a lathe and further illustrating apiece of worlr stock secured within a revolving chuck to project within the cutter head. Fi 2 is a view in longitudinal section as seen on the line 2-2 of Fig. l illustrating the correlation existing between the component parts of the cutter head and further `shows the turning tools as acting upon the work.

Fig. 8 is a fragmentary view in end elevation illustrating the manner in which adjustinent is afforded the tools and bits to determine the depth of eut the) shall maire.

Fig. l is a view in transverse section as seen on the line l-t of Fig. 2 viewed in the direction of the arrows and illustrating the radial mounting1 of the tools and hits and the manner in which these members are reciprocated in relation to the worlr.

Fig. is a view iu `transverse section as seen on the line li 5 of Fig. 2 and particulai'ly illustrates the mounting of a circumferential coil spring which is provided to rotate the movable portion of the head when released.

Fig. 6 is a view in elevation with parts broken away to illustrate the manner in which the cutter head is released after the threads have been completed.

Fig. 7 is a view in perspective illustrating one of the turning tools.

Fig. 8 is a view in perspective illustrating one of the die bits. l

Fig. 9 is a fragmentary view in section illustrating the manner. in which each of the cutters is initially held within the cutter head prior to actuation.

Referring more particularly te the drawings, lll indicates the tubular shank of a cutter head s and which here `sli-own as mounted against rotation within a tail stock ll of the lathe. The shank l0 is formed with an enlarged annular shoulder 12 which occurs midway the length ot the shank and Within Which a series ot' cylindrical pockets 13 `are formed. The pockets are spaced equal distances around the shank. A tubu lar extension lil is formed upon the inner end of the shank and is provided with keys 15 which slidingly spline the cutter head upon the tubular extension la.

Cutter head 17 is cylindrical in shape7 of an outside diameter equal to the diameter of the shoulder.l 12 and is formed with an extension having two `annular faces of reduced diameters 18 and 19. The tace 19 terminates against the square face ol the shoulder 12 and normally is held thereagainst by means et coil springs 20 which are positioned within the recesses 13 and iv iich bear upon the rear faces of the heads of bolts 21. riheSe bolts are threaded and are se-. cured Within the cutter head extension. The enlarged portion of the cutter head is formed With a series of radial slots, here shown as eight in number, within which turning tools 23 and die bits 2st are alternately mounted.

The turning tools 23 are formed With straight grooves 25a extending along their front face and adapted to engage keys 25 detachably mounted Within recesses 25 formed along the radial grooves in the cutter head. rlhe die bits are formed in a similar manner and thus the tools and bits may be freely reciprocated without danger of being throivn out of alinement. The recesses Withineach face of the radial slots permit the tools to be interchanged and the keys reversed when left hand threads are to be cut. rlhe outer ends of the slots arevcovered by an annular plate 26 which prevents chips and dirt from getting into the'sl'iding ivays provided for the tools.

As a means for producing reciprocation ot the tools and-bits each oi them is 'tormed With a transverse slot 27, one in each edge, which is engaged by one et the arcuately shaped cams 28 or 29. The cams 28 are provided to engage the die bits and the cams 29 are provided to engage the turning tools. Reference being had to Fig. 1l, it will be seen that the 'cams are arranged in pairs oppositely and outwardly diverging from each other. These cams are formed inteOral with a rotatableactuating cam sleeve 30 which is mounted upon the annular face 1S ot the cutter head and which may be rotated by handle 31 to advance and retract the various tools and bits simultaneously. A tiller ring 32 is disposed upon the face 19 ot the cutter head and between the shoulder 1:? and the cam sleeve 30. This member is secured against rotation by a series ot set screws'i which are threaded into both the ring and face 19, thus forming a lined channel within which the actuating cam sleeve 30 may be rotated. rl`he cutters are initially engaged by balls 1G held by spring l-T, as shown in Fig. 9 ol the drawings.

yihe actuating cani sleeve l() is adapted to be held in a position to cane the advance ot the turning tools by a circum'liercntially dis posed spring St which is adjustably secured at one end to the iiller rin." '32 by ay lug 32 and at the other end against a lug 230 on the actuating cam sleeve l l. The advance and retraction ol the tools and bits is limited by a pin plunger 35 which is adapted to alternately engage a recess within a lock block 36 or 36, as shown in Fig. l ot the drawings. This block ma).Y be adjusted along an arcuate slot i7 to determine the movement ot rotation allowed the cani sleeve 3. ylhe pin plunger 33 is slidably mounted within a bushing 3S and is held in its outermost position by a. spring 3S). The bushing 3S and the pin l5 are tree to move along an arcuate slot lS termed through the cam sleeve 30. .is a means .tor relieving the pin from strain when thc head rotates by means of the spring Cil-l, an adjustable bloclr eti) is mounted at one end ot the slot y-18 and adjustably held by a set .screw 50, as shown in Fig. 5 ci the drawings. llctractive movement of the plunger may be etlected by the rotation ot a handle sleeve Ll() Which acts to move a. pin ll secured to the rear end of the plunger 35. '.l`hus it will be seen that when the use o'l the turningtools is not desired, the plunger ilo must be retracted and the actuating ring rotated until the plunger registers with the lock bloelc 36', thus retracting the turning tools and advancing the die bits to malte a cut.

ln operation, the round work stoel; is secureik wit-hin a chuclr and rotated thereai'ter. The tail stock ot the lathe will be advanced to cause the turning tools to rut the diameter o'll the work stock down as leterniined by `gradnation 'll mai-lied along: the shoulder and adapted to register with pointers #t1 mounted to move u ith loclv' bolts Llwhich clamp the lock blocli's -il'i and lt'/ in position7 as shown in Fig. l oi' the dra\\'- ings. )is the cutter l )ad is advanced the work stock will be turned down to a sired diameter and in rendition lo be threaded. This operation is performed by rotating the handle sleeve el() by the pin lil to retract the plunger 35 a'ttcr which the actuating' cani sleeve 30 may be rota 'ed b v the handle 81. rllhis action will cause the cam faces of lugs t28 and 29 to pass along the slots Q7 in the cutter and retract the turning tools while advancing the die bits. After this adjustment has been made. the cutter head may be again advanced alongv the previously turned work. thus threruling;- it. When the proper length ot' thread has been cut by the die bits. the tail stoetY may be retracted. lVhen this movement takes l. El. l?

andante place the cutter head and shoulder l2 upon the ltubulaishanlr will be separated due to the resistance oit the die bits to the threads on the Work stock and at the time oli separa- `j, tion the plunger 35 ivill be Withdrawn -,troni the recess in the lock block 36. When the plunger has been thus released the spring1 vvill quickly rotate the zuztuatingl cam sleeve BO to ret 1act the die bits and advance the turning tools, thus freeing the cutter head trom the Work and preparingI the device ior 'the reception ot another piece of Worlr stock. Vlihe bushing),` 38 will strike the bloch t9 and the pin will thereafter itall into the bore in block, 3G.

lt will thus be seen that the cutter head here provided may be actuated in a simple manner to turn a piece of Work stoclr down to a given diameter, alter which the turniup,1 tools may be readily relieved and die bits set at a predetermined dimension to thread the Work. llt Will be further noted that the head will act automatically to release the vvorlr stoel; troni the dies and prepare it 'tor liuture operations.

rlhe screw threading dies and the turning' tools or cutters are in the same circumlerential plane and are interchangeable and reversible, so that a Lgiven right or left hand thread may be out clear to the shoulder `loi-med by the turningI too-ls, and the cutters and dies are connected together to be moved in and out in opposite directions simultaneously by a simple movement of a handle.

ll claim:

l. lli cutter head, comprising a body portion, a series of turning tools radially mounted therein, a series oi die bits radially mounted and alternately disposed in relan tion to said turning` tools, means for normally maintainin the turning,- tools in oper ative position in relation to a piece olf Work, and means lor alternating the position olf 'the tools and bits in relation to said Work,

and means for automatically relieving' the die bits from the Work when the thread has been cut.

2. l cutter head, comprising,- a body portion, a series oit turning tools reciprocably moi'lnted tliereupon, a series of die bits reeiprocably mounted upon said body portion, and means for alternately disposing the tools and bits in Quitting rela-tion to a piece ol Work, the turning tools and die bits being in the same circumferential plane so that the bits Will cut threads to the shoulders termed by the tools.

3. lli cutter head, comprising a body inember, a series oit turning;1 tools reciprocably mounted upon said member, a series of die bits reciin'ocably .mounted upon said member, means lfor alternately retractinu;1 and advancing said tools and bits simultaneously, and means for maintaining said tools and bits: in their alternate position, the turning; tools and die bits beinp1 in the saine eireu1nlerential plane so that the bits will cut threats to the shoulders :termed by the tools.

il. it die head, comprisii Y i body member, a series ot turningu tools radially mounted 'for reciprocal movement thereupon, a series oit die bits mounted upon said body membei' for reciprocal moi` ent, nmnually operated rneans l'or retrac; the turning; tools and advancing` the die bits in relation to a piece of Work, and automatically operating means lor retractinn; the die bits and restoring; the ti'lrning tools to their original position.

5. lli cutter head, connu-isindl a body inem bei', a series of radially disposed turning' tools and die bits mounted upon said member in alternate relation to each other, manually operated means lier alternately reciproeatinnl said tools and bits to advance one set into Contact with a piece olf worlr, and automatically operated means li'or restoring said tools and bits to their original position.

(l. llt die head, colmar-isindl a body member, a series oli turning' tools mounted lier reciprocable movement thereupon, a series et die'bits reciprocably mounted upon sairl body member, and adjustable means tor regulating the depth at which the tools and bits Will operate, the turning tools and die bits being in the same circumferential plane so that the bits Will out threads to the shoulders formed by the tools.

7. rl. die head, comprising a body nie1nber, a series olf turning' tools mounted tor reciprocable movement thereupon, a series oi? die bits reciprocably mounted upon said body member, adjustable means lor regulating the depth at which the tools and bits Will operate, and means whereby the tools and bits may be alternately reciprocated 'to cut at the depth at which the adjusting;1 mechanism set, the turningl tools and die bits being;l in the same circumferential plane so that the bits will cut threads 'to the shoulders liormed by the tools.

8. il die head, comprisingv a body member, a series ot turningtools mounted itor reciprocable movement thereupon, g. series et die bits reciprocably mounted upon said body member, adjustable means lor regir lating; the depth at which 'the tools and bits will operate, means whereby the tools and bits may be alternately reoiproeated to out at the depth at which the adjusting,` mech anism set, and means whereby the bits and tools may be loelred in a rigid position during; theirl cutting operations, the turning,1 tools and die bits being in the saine circumferential plane so that the bits will cut threads to the shoulders 'formed by the tools.

9. lin a die head, a body member having radial slots and key ways extending' troni both sides ol each slot, a series ot turning ldd lll@

tools and a series of threading tools interthe threading' tools Will cut right or left chungeably and reversibly fitting' suicl slotsv threads to the` shoulders ifm-ined by the turnand each having a longitudinally extending ing tools. i key Way upon one side for registering with In testimony whereof l hure signed my 5 the slot key Ways, and keys for the key-Ways, name to this speciicution.

the turning tools and threading tools being in the same circumferential plane, so that NELS l). PETERSEN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents Washington, D. S. 

